InGaN UV bare칩을 이용한 $CaAl_{12}O_{19}:Mn^{4+}$ 형광체의 적색 발광다이오드 제조

강현구,박정규,김창해,최승철,Kang, Hyun-Goo,Park, Joung-Kyu,Kim, Chang-Hae,Choi, Seung-Chul 한국마이크로전자및패키징학회 2007 마이크로전자 및 패키징학회지 Vol.14 No.4

A $CaAl_{12}O_{19}:Mn^{4+}$ red phosphor showed the highest emission intensity at a concentration of 0.02mole $Mn^{4+}$ and the high crystallinity and luminescent properties were obtained at $1600^{\circ}C$ firing temperature for 3hr. The synthesized phosphor showed a broad emission band at 658nm wavelength. Red light-emitting diodes(LEDs) were fabricated through the integration of on InGaN UV bare chip and a 1:3 ratio of $CaAl_{12}O_{19}:Mn^{4+}$ and epoxy resin in a single package. This coated LED can be applicable to make White LEDs under excitation energy of UV LED. [ $CaAl_{12}O_{19}:Mn^{4+}$ ] 적색 형광체는 $Mn^{4+}$이온이 0.02 mol 첨가되었을 때 최대 발광 세기가 관찰되었고 $1600^{\circ}C$, 3시간 소성조건에서 우수한 결정성과 발광 효율을 나타내며 중심 파장이 658 nm에서 관찰되었다. 본 연구에서 개발된 $CaAl_{12}O_{19}:Mn^{4+}$ 형광체를 에폭시와 함께 1:3으로 혼합하여서 InGaN UV 발광체의 Bare 칩 위에 코팅하여 중심파장이 658 nm인 적색 LED를 제조하였다. 적색 형광체를 이용하여, 기존의 UV LED를 여기 광원으로 다양한 느낌의 백색 발광체를 설계 할 수 있을 것이다.

중복도 격간벽 구조시스템의 내진성능평가

강현구,이준호,김진구,Kang, Hyun-Goo,Lee, Joon-Ho,Kim, Jin-Koo 대한건축학회 2011 대한건축학회논문집 Vol.27 No.9

In this study seismic performance of rectangular reinforced concrete staggered wall system(SWS) structures with middle corridor were evaluated. To this end, 6, 12, and 18-story SWS structural models were designed and were analyzed by pushover analysis to observe the force-displacement relationship up to failure and the location of plastic deformation. Also response modification factors were computed based on the overstrength and the ductility capacities obtained from capacity envelopes. The analysis results showed that plastic hinges formed first at connection beams located between two staggered walls and the structures failed by formation of weak stories. When the bending rigidity of the connection beams increased up to 100%, the overstrength increased by only about 25%. When the reinforcement ratio was increased by 50%, the overstrength increased by about 40%. The replacement of the RC connection beams with steel box beams resulted in superior performance of the structures with reduced beam depth. The response modification factors ranged between about 4.0 and 6.0 with the average value around 5.0. Based on these observation it was concluded that the staggered wall systems with a middle corridor have enough capacity to resist the design seismic load.

Ag 코팅한 W-Ag 전기접점/Cu 모재간의 브레이징 접합 특성

강현구,강윤성,이재성,Kang Hyun-Goo,Kang Yun-Sung,Lee Jai-Sung 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.1

The brazing adhesion properties of Ag coated W-Ag electric contact on the Cu substrate have been investigated in therms of microstructure, phase equilibrium and adhesion strength. Precoating of Ag layer ($3{\mu}m$ in thickness) on the $W-40\%Ag$ contact material was done by electro-plating method. Subsequently the brazing treatment was conducted by inserting BCuP-5 filler metal (Ag-Cu-P alloy) layer between Ag coated W-Ag and Cu substrate and annealing at $710^{\circ}C$ in $H_2$ atmosphere. The optimum brazing temperature of $710^{\circ}C$ was semi-empirically calculated on the basis of the Cu atomic diffusion profile in Ag layer of commercial electric contact produced by the same brazing process. As a mechanical test of the electric contact after brazing treatment the adhesion strength between the electric contact and Cu substrate was measured using Instron. The microstructure and phase equilibrium study revealed that the sound interlayer structure was formed by relatively low brazing treatment at $710^{\circ}C$. Thin Ag electro-plated layer precoated on the electric contact ($3{\mu}m$ in thickness) is thought to be enough for high adhesion strength arid sound microstructure in interface layer.

조경기술사 시험의 출제경향 - 현행 기출문제에 대한 수험생의 인식정도를 중심으로 -

강현구,김학범,Kang, Hyun-Goo,Kim, Hak-Beom 한국조경학회 2010 韓國造景學會誌 Vol.38 No.5

본 연구는 조경기술사 검정제도의 출제문제에 대하여 수험생들이 인식하는 체감 정도, 즉 문제의 객관성, 적정성, 난이도 등 출제되는 문제의 전반에 대한 경향을 분석 제언하여 검정제도가 학술적, 체계적으로 개선됨으로써, 조경기술사 검정제도의 정착과 조경기술사 자격의 위상 확립, 산업현장에서의 조경분야 지위 향상 등 전반적인 조경발전을 목적으로 이번 연구를 실시하였다. 조사방법은 두 단계로 나누어 전문가 집단을 활용하여 출제되는 과목 및 과목의 배정에 관한 사항을 조사하였고, 수험생 및 자격취득자를 대상으로 출제문제의 수준, 객관성, 난이도, 출제경향 등 출제되는 문제의 전반에 대해 설문조사를 실시하였다. 분석결과, 먼저 조경기술사 검정 시 출제되는 과목이 국가기술자격법 시행규칙에 제시된 시험과목과는 달리 출제되고 있었으며, 과목배정, 시험문제의 객관성, 수준, 난이도 등에서 다양한 문제점을 내포하고 있는 것으로 나타났다. 이러한 문제점의 원인은 여러 가지 요인이 있겠지만 충분한 검토 없이 문제출제, 출제위원의 관리 미흡 등 현재 진행되고 있는 검정제도의 시스템을 운영하는데 문제가 있지 않나 판단된다. 따라서 이러한 문제점을 보완하기 위해 '출제되는 시험과목의 정비', '적정한 과목 배정 및 문제의 객관성 확보', '출제문제의 수준 및 난이도 유지', '출제 시스템 개선'등에 대하여 관련부처나 단체에서는 효율적인 개선노력이 필요함을 제언하였다. This research analyzed the overall issues pertaining to the questions that appear in the professional landscape architect screening system to assess 1he recognition of test-takers when it comes to the test questions in terms of the question objectivity, appropriateness, difficulty level and so forth The purpose of this is to present a set of recommendations so that the screening system can he improved and the professional landscape architect screening system consolidate its position. This in turn can help the professional landscape architect qualification process consolidate its position and improve the status of the landscape area in the industrial field. The research of this study was conducted for the all-round development of Landscape Architecture. The research method was divided into two stages, and a group of experts was leveraged to study subjects that are tested and subjects allocated. A survey was conducted of candidates and certification holders to assess the questions that appear in the test in terms of their level, objectivity, difficulty level, tendency of questions and so forth. Firstly, the study demonstrated that the subjects tested in the professional landscape architect test are different from the testing subjects that are suggested in the enforcement ordinance of the National Technical Professional Law. In addition, o1her problems include the overvaluation of a subject for testing, a lack of objectivity in testing, and difficulty level adjustment of questions. One main reason for many of these kinds of problems is that the questions appeared without thorough review and there is a lack of management concerning the members of the commtittee that develops the question. Accordingly, to make up for these problems, a viable screening system such as the reorganization of subjects that are tested, assigning suitable subjects, securing of question objectivity, and difficulty level of developed questions are necessary.

액션의 온라인 부분계산

강현구(Hyun-Goo Kang),도경구(Kyung-Goo Doh) 한국정보과학회 1999 정보과학회논문지(B) Vol.26 No.12

프로그래밍 언어의 의미를 정형적으로 표기하는 기법인 액션의미론을 기반으로 한 컴파일러 생성기는 프로그래밍언어의 액션의미구조가 주어지면 그 언어의 컴파일러를 자동으로 생성한다. 생성된 컴파일러는 먼저 원시 프로그램을 그에 상응하는 액션 프로그램으로 확장한 후, 목적 프로그램으로 컴파일 한다. 여기서 액션 프로그램은 일종의 중간코드로 쓰이므로, 효율적인 목적코드를 생성하기 위해서 중간코드의 성능향상이 필요하다. 본 논문에서는 액션 프로그램을 부분계산을 통해 효율적인 코드로 자동 변환해 주는 온라인 액션 부분계산기를 설계하고 구현한다. 선행 연구된 오프라인 방식에서 전역분석을 하지 않고는 불가능했던 요약캡슐의 몸통, 펼치기의 몸통에 대한 부분계산이 온라인 방법을 사용하면 가능함을 보이고, 명령형 액션의 부분계산도 추가적으로 수행할 수 있도록 확장한다. Action Semantics is a framework for formally defining the semantics of programming languages. Action semantics-directed compiler generators take an action semantics definition of a programming language and automatically generate a compiler of the language. The generated compiler first expands a source program into an action denotation of the program, and then compiles it to a target code. In these compiler-generation systems, it is important to statically process the expanded action denotation - used as an intermediate code - as much as possible so that the generated compiler can produce better target code In this paper, we develop an automatic action-transformation method based on online partial evaluation. The previous off-line method was rather weak because it could not partially evaluate actions inside the body of abstraction and unfolding-action without performing separate global analysis. The proposed online method remedies the problem, thus naturally improves the quality of residual actions. Moreover, we also extend the method to partially evaluate imperative actions.

nML을 이용한 기술용어 사전 시스템 구축

강현구(Hyun-Goo Kang),이광근(Kuangkeun Yi) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1A

ML은 엄밀한 수학적 모델에 기반하여 구현된 프로그래밍 언어로서 고차함수, 복합형 함수와 엄격한 타입시스템을 지원하는 언어이다. nML은 한국과학기술원 프로그램 분석 시스템 연구단에서 연구중인 프로그램 분석 기술을 최대한 반영하여 구현하고 있는 ML의 한국형 사투리이다. 본 논문에서는 nML을 이용하여 일반적이고 자주 사용되는 프로그래밍이 국면을 다양하게 반영한 응용프로그램을 구축하여 보았다. 구현하고자 하는 시스템은 중앙 집중형 데이터 서버를 가지는 기술용어 사전 시스템으로서 KDIC이라 명하였다. 본 시스템이 목적은 특정 분야에서 영어 용어들에 대한 전문인의 한글 용어로의 번역 사례를 모은 데이터 베이스를 구축하고, 이러한 번역 사례가 자연스럽게 이용되고자 함에 있다.

중복도 격간벽 구조시스템의 내진성능평가

강현구(Kang Hyun-Goo),이준호(Lee Joon-Ho),김진구(Kim Jin-Koo) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.9

In this study seismic performance of rectangular reinforced concrete staggered wall system(SWS) structures with middle corridor were evaluated. To this end, 6, 12, and 18-story SWS structural models were designed and were analyzed by pushover analysis to observe the force-displacement relationship up to failure and the location of plastic deformation. Also response modification factors were computed based on the overstrength and the ductility capacities obtained from capacity envelopes. The analysis results showed that plastic hinges formed first at connection beams located between two staggered walls and the structures failed by formation of weak stories. When the bending rigidity of the connection beams increased up to 100%, the overstrength increased by only about 25%. When the reinforcement ratio was increased by 50%, the overstrength increased by about 40%. The replacement of the RC connection beams with steel box beams resulted in superior performance of the structures with reduced beam depth. The response modification factors ranged between about 4.0 and 6.0 with the average value around 5.0. Based on these observation it was concluded that the staggered wall systems with a middle corridor have enough capacity to resist the design seismic load.

액숀 의미구조를 통한 객체지향 언어의 의미 고찰

강현구(Hyun-Goo Kang),도경구(Kyung-Goo Doh) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅳ

본 논문에서는 간단한 객체지향 언어에 대한 의미를 액숀 의미 구조로 표현하여 보고, 이를 통해 객체 지향 언어의 정형적 의미(formal semantics)를 액숀 의미구조를 통하여서는 어떻게 이해 할수 있는지를 고찰한다.

문화콘텐츠 개발을 위한 문학창작론 -에듀테인먼트 출판물을 중심으로-

강현구 ( Hyun Goo Kang ) 한국현대문예비평학회 2006 한국문예비평연구 Vol.- No.20

아토피피부염 환자에서 국소 스테로이드 사용에 따른 혈청 스테로이드 농도 측정

강현구 ( Hyun Goo Kang ),이선아 ( Sun Ah Lee ),김현정 ( Hyun Jung Kim ),염혜영 ( Hye Yung Yum ) 대한천식알레르기학회(구 대한알레르기학회) 2017 Allergy Asthma & Respiratory Disease Vol.5 No.2

Purpose: Most of the atopic dermatitis (AD) patients and their parents refuse topical treatment because of concern about generalized side effect due to systemic absorption of topical corticosteroids. Therefore, a large number of studies reported difficulty in properly controlling in AD. However, investigations of the percutaneous absorption of topical corticosteroids are still insufficient. Methods: One hundred nine patients who visited our atopy clinic and diagnosed as AD by a physician from January 2005 to January 2012 were enrolled. We examined serum corticosteroid (clobetasol propionate, hydrocortisone) level by liquid chromatography (LC) coupled with a tandem mass spectrometric (MS/MS) method. Results: We developed the LC-MS/MS method to determine corticosteroids (clobetasol propionate, hydrocortisone) in sera of AD patients. Also, we confirmed precision, accuracy, limit of detection, limit of quantification, absolute recovery, and relative recovery of the experimental methods. We could not detect clobetasol propionate or hydrocortisone in sera of 109 AD patients using the newly developed LC-MS/MS method. Conclusion: Regardless of age, the severity and illness duration of AD, clobetasol and hydrocortisone were not detected in sera. Although there are many other factors of determining systemic absorption of topical medications, our results showed that topical corticosteroids applied for several years in AD patients may be under the limit of detection in their sera by the LC-MS/MS method. (Allergy Asthma Respir Dis 2017:5:79-82)